JPH0535355Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a wheel train indicating structure in a pointer type timepiece equipped with a pointer train.

[Conventional technology]

In order to reduce the size of pointer type watches, especially pointer type electronic watches, a watch movement structure in which a thin, small, high capacity battery is stacked on the pointer wheel train is often used as an effective arrangement means.

FIGS. 3 and 4 show cross-sectional views of the main parts of a conventional device using the above structure.

A center shaft 2 is installed in the center bridge 1, and a center wheel 4 on which a minute hand 3 is mounted is mounted on the center shaft 2, and an hour wheel 6 on which an hour hand 5 is mounted on the center shaft 2. Each is supported by a shaft. Between the second wheel & pinion 4 and the hour wheel 6, there is interposed a rear wheel 7 consisting of a rear gear 7a and a rear pinion 7b together with the extension 12a of the winding stem spacer and the main plate 8. The rear pinion gear 7a meshes with the pinion portion 4a of the second wheel & pinion 4, and the pinion pinion 7b meshes with the hour wheel 6 at a required ratio of the number of teeth, respectively, to form a pointer wheel train.

And the day reverse gear 7 is the day reverse gear 7a.
The bottom side of the main plate 8 which forms the base of the clock movement
The upper surface side is for storing the winding stem 9, which is an external operating member for adjusting the time, and known backing parts such as a mandarin duck 10 and a cannula 11 that provide moderation during operation of the winding stem 9. It is supported by an extending portion 12 a that is an extending portion of the winding stem spacer 12 provided on the main plate 8 . Here, since the material used for the winding stem spacer 12 is generally complex in shape, it is integrally molded from synthetic resin.

Reference numeral 13 denotes a battery, which is mounted on the middle support 1 via an insulating seat 14 so as to overlap the pointer wheel train, and a battery receiving spring 15 housed in the recess 1a of the middle support 1 is mounted on the negative electrode side of the lower surface. are in contact with each other.

Reference numeral 16 denotes a train wheel bridge, which supports the outer periphery of the battery 13 and supports the upper tenon of the drive train wheel (not shown). Incidentally, as shown in FIG. 4, there is an allowance in the cross-sectional gap between the back part storage part and the battery 13.

[Problem that the invention attempts to solve]

As mentioned above, the pointer wheel train has a configuration in which the hinoshi wheel 7 is located between the second gear 4b and the hour wheel 6, the bottom side is the main plate 8, and the top side is the extension of the winding stem spacer 12. The central part of the watch,
That is, the number of overlapping parts of the hand wheel train is quite large when considering the mounting of the battery, and in order to make the thickness of the watch as thin as possible, it is necessary to reduce the thickness of each of the above-mentioned parts individually.

However, in the conventional structure, in particular, the winding stem spacer 1 supporting the rear gear 7a from the upper surface
Since the material of No. 2 is a synthetic resin, there is a limit to how thin the extending portion 12a of the winding stem spacer 12 can be made thin due to constraints such as strength and molding, and also due to the characteristics of the synthetic resin. , the second wheel & pinion 4 or the reverse gear 7a due to warping due to changes over time.
It is necessary to provide sufficient clearance between each part so that the winding stem spacer extension part 12a does not come into contact with the winding stem spacer extension part 12a and impede rotation.From this point of view, the synthetic wood winding stem spacer 12 extensions 1
Supporting the dial gear 7a at 2a was largely due to an increase in the thickness of the clock.

Although there is a conventional example in which a dedicated part is provided to support the Hinouraguruma 7 from the upper surface side, it is unavoidable that it is disadvantageous in terms of installation space, cost, etc.

It is an object of the present invention to solve the above-mentioned problems and provide a wheel train support structure for a pointer train wheel suitable for a thin and small watch.

[Means for solving problems]

In order to achieve the above object, the present invention has the following configuration. That is, in order to attach the main plate constituting the clock movement, the minute hand and hour hand for time display, a center wheel and hour wheel are arranged approximately in the center of the clock movement, and a center wheel and hour wheel are respectively engaged with the center wheel and hour wheel. A matching wheel, a circuit board having a drive IC and a crystal oscillator, the second wheel, the hour wheel,
In the pointer type timepiece, the pointer type timepiece has a receiving member for supporting a wheel train consisting of a minute wheel, etc., and a battery that overlaps the second wheel and hour wheel in plan view and is disposed on the upper part of the receiving member. A part of the circuit board is a layered portion of the base plate, the receiving member, and the battery, and has an extending portion projecting between the base plate and the receiving member. The circuit board is characterized in that the circuit board is supported between the extending portions of the circuit board so as to maintain its stiffness.

〔Example〕

An embodiment of the present invention will be described below based on the drawings.

FIG. 1 is a plan view of a main part showing an embodiment of the present invention, and FIG. 2 is a sectional view of the main part.

Reference numeral 20 denotes a main plate that forms the base of the timepiece movement, and a circuit board 23 that forms the body of a circuit block on which a driving IC 21, a crystal oscillator 22 as a time standard source, etc. are mounted is disposed on the main plate 20. There is. Reference numeral 24 denotes a second wheel and pinion, which is pivotally supported by a central shaft 26 implanted in the center bridge 25, and has a minute hand 27 attached to its tip. The second pinion 2a provided on the second wheel 24 has a rear gear 28 constituting the rear wheel 28.
The hour wheel 3 is in mesh with the hour wheel 28b, which is the pinion portion of the hour wheel 28, which is pivotally supported by the center wheel 24, and has an hour hand 29 attached to its tip.
0 and constitutes a pointer wheel train.

Here, the day reverse gear 28 is the day reverse gear 2.
The lower surface side of 8a is supported by the base plate 20, and the upper surface side is supported by the extension part 23a of the circuit board 23 while holding a required amount of agitation. 23b is a Hinoturakana 28b protruding from the lower surface of the Hinoturaguruma 28.
This is an escape hole through the tail of the body.

Further, the radial direction of the hino-ura wheel 28 is guided by the hino-ura wheel support hole 20a provided in the base plate 20 by the hino-ura wheel seat 28c fixed between the hino-ura gear 28a and the hino-ura wheel pinion 28b. This is done by passing the shaft through the

Here, the material used for the circuit board 23 is generally a thin copper-clad laminate based on epoxy that has excellent rigidity and heat resistance, and has lower strength than an injection molded product of the same thickness. It is widely used in the circuit boards of electronic watches.

31 is a battery, and an insulating seat 32 is placed on the middle support 25.
The battery receiving spring 3 is mounted on the negative electrode side.
3. Battery side pressure springs 34 are in contact with the anode side, respectively, to achieve the required conduction.

Reference numeral 36 denotes a drive coil, which is disposed so as to overlap the circuit board 23 in cross section. The wheel train bridge 35 supports the upper tenon side of the rotor 39 and the fourth wheel & pinion 31, which are the driving wheel train, and holds the outer peripheral portion of the battery 31. 37 and 38 connect the circuit board 23, drive coil 36, middle bridge 25, and gear train bridge 35 to the base plate 2.
This is a screw that is fixed to 0.

[Effect of idea]

As described above, according to the present invention, in the pointer wheel train consisting of the second wheel and hour wheel that determine the thickness of the center part of the watch, and the hour wheel that meshes with the second wheel and hour wheel, respectively, By adopting a structure in which the Hi-no-ura car is supported by the extension of the circuit board that forms the base of the circuit block and the base plate with the necessary Akagi, there is no need to provide a support member dedicated to the Hi-no-ura car. Not only can the thickness of the central part of the watch be reduced, but also the space on the circuit board extending over the top of the Hinoura wheel can be used for pattern wiring, which is particularly effective in terms of space utilization in small watches. It is a means and has great practical effects.

[Brief explanation of the drawing]

Figure 1 is a plan view showing one embodiment of the present invention;
The figure is a sectional view of the main part of FIG. 1, and FIGS. 3 and 4 are sectional views of the main part showing the conventional example. 20...Main plate, 21...Drive IC, 22...Crystal oscillator, 23...Circuit board, 23a...Extension part, 24...Second wheel, 28...Hinoshi wheel.

Claims (1)

[Scope of utility model registration request] A main plate constituting a clock movement, a center wheel and an hour wheel arranged approximately in the center of the clock movement for mounting a minute hand and an hour hand for time display, and a date meshing with the center wheel and hour wheel, respectively. , a circuit board with a drive IC and a crystal resonator,
A receiving member for supporting a wheel train consisting of the center wheel, hour wheel, hour wheel, etc.; and a battery that overlaps the center wheel and hour wheel in plan view and is disposed above the receiving member. In the pointer type timepiece, the circuit board has a portion in which the base plate, the receiving member, and the battery are laminated, and has an extending portion projecting between the base plate and the receiving member, and 2. A wheel train support structure for a pointer type timepiece, wherein the hour wheel is supported so as to maintain an offset between the base plate and the extension of the circuit board.